Hi, hackers!
We started discussion about overheads and how to calculate it correctly.
Julien Rouhaud wrote:
Can you give a bit more details on your bench scenario? I see
contradictory
results, where the patched version with more code is sometimes way
faster,
sometimes way slower. If you're using pgbench
default queries (including write queries) I don't think that any of
them will
hit the loop code, so it's really a best case scenario. Also write
queries
will make tests less stable for no added value wrt. this code.
Ideally you would need a custom scenario with a single read-only query
involving a nested loop or something like that to check how much
overhead you
really get when you cumulate those values.
I created 2 custom scenarios. First one contains VERBOSE flag so this
scenario uses extra statistics. Second one doesn't use new feature and
doesn't disable its use (therefore still collect data).
I attach scripts for pgbench to this letter.
Main conclusions are:
1) the use of additional statistics affects no more than 4.5%;
2) data collection affects no more than 1.5%.
I think testing on another machine would be very helpful, so if you get
a chance, I'd be happy if you share your observations.
Some fixes:
Sure, but if we're going to have a branch for nloops == 0, I think it
would be
better to avoid redundant / useless instructions
Right. I done it.
Justin Pryzby wrote:
Maybe set parallel_leader_participation=no for this test.
Thanks for reporting the issue and advice. I set
parallel_leader_participation = off. I hope this helps to solve the
problem of inconsistencies in the outputs.
If you have any comments on this topic or want to share your
impressions, please write to me.
Thank you very much for your contribution to the development of this
patch.
--
Ekaterina Sokolova
Postgres Professional: http://www.postgrespro.com
The Russian Postgres Company
From: Justin Pryzby <pryz...@telsasoft.com>
Subject: [PATCH 1/2] explain.c-refactor-ExplainNode_v3
---
src/backend/commands/explain.c | 110 ++++++++++++++-------------------
1 file changed, 48 insertions(+), 62 deletions(-)
diff --git a/src/backend/commands/explain.c b/src/backend/commands/explain.c
index 5d1f7089daf..bd785c6741d 100644
--- a/src/backend/commands/explain.c
+++ b/src/backend/commands/explain.c
@@ -118,6 +118,8 @@ static void show_instrumentation_count(const char *qlabel, int which,
PlanState *planstate, ExplainState *es);
static void show_foreignscan_info(ForeignScanState *fsstate, ExplainState *es);
static void show_eval_params(Bitmapset *bms_params, ExplainState *es);
+static void show_loop_info(Instrumentation *instrument, bool isworker,
+ ExplainState *es);
static const char *explain_get_index_name(Oid indexId);
static void show_buffer_usage(ExplainState *es, const BufferUsage *usage,
bool planning);
@@ -1615,36 +1617,7 @@ ExplainNode(PlanState *planstate, List *ancestors,
if (es->analyze &&
planstate->instrument && planstate->instrument->nloops > 0)
- {
- double nloops = planstate->instrument->nloops;
- double startup_ms = 1000.0 * planstate->instrument->startup / nloops;
- double total_ms = 1000.0 * planstate->instrument->total / nloops;
- double rows = planstate->instrument->ntuples / nloops;
-
- if (es->format == EXPLAIN_FORMAT_TEXT)
- {
- if (es->timing)
- appendStringInfo(es->str,
- " (actual time=%.3f..%.3f rows=%.0f loops=%.0f)",
- startup_ms, total_ms, rows, nloops);
- else
- appendStringInfo(es->str,
- " (actual rows=%.0f loops=%.0f)",
- rows, nloops);
- }
- else
- {
- if (es->timing)
- {
- ExplainPropertyFloat("Actual Startup Time", "ms", startup_ms,
- 3, es);
- ExplainPropertyFloat("Actual Total Time", "ms", total_ms,
- 3, es);
- }
- ExplainPropertyFloat("Actual Rows", NULL, rows, 0, es);
- ExplainPropertyFloat("Actual Loops", NULL, nloops, 0, es);
- }
- }
+ show_loop_info(planstate->instrument, false, es);
else if (es->analyze)
{
if (es->format == EXPLAIN_FORMAT_TEXT)
@@ -1673,44 +1646,16 @@ ExplainNode(PlanState *planstate, List *ancestors,
for (int n = 0; n < w->num_workers; n++)
{
Instrumentation *instrument = &w->instrument[n];
- double nloops = instrument->nloops;
- double startup_ms;
- double total_ms;
- double rows;
- if (nloops <= 0)
+ if (instrument->nloops <= 0)
continue;
- startup_ms = 1000.0 * instrument->startup / nloops;
- total_ms = 1000.0 * instrument->total / nloops;
- rows = instrument->ntuples / nloops;
ExplainOpenWorker(n, es);
- if (es->format == EXPLAIN_FORMAT_TEXT)
- {
- ExplainIndentText(es);
- if (es->timing)
- appendStringInfo(es->str,
- "actual time=%.3f..%.3f rows=%.0f loops=%.0f\n",
- startup_ms, total_ms, rows, nloops);
- else
- appendStringInfo(es->str,
- "actual rows=%.0f loops=%.0f\n",
- rows, nloops);
- }
- else
- {
- if (es->timing)
- {
- ExplainPropertyFloat("Actual Startup Time", "ms",
- startup_ms, 3, es);
- ExplainPropertyFloat("Actual Total Time", "ms",
- total_ms, 3, es);
- }
- ExplainPropertyFloat("Actual Rows", NULL, rows, 0, es);
- ExplainPropertyFloat("Actual Loops", NULL, nloops, 0, es);
- }
+ show_loop_info(instrument, true, es);
+ if (es->format == EXPLAIN_FORMAT_TEXT)
+ appendStringInfoChar(es->str, '\n');
ExplainCloseWorker(n, es);
}
}
@@ -4099,6 +4044,47 @@ show_modifytable_info(ModifyTableState *mtstate, List *ancestors,
ExplainCloseGroup("Target Tables", "Target Tables", false, es);
}
+void
+show_loop_info(Instrumentation *instrument, bool isworker, ExplainState *es)
+{
+ double nloops = instrument->nloops;
+ double startup_ms = 1000.0 * instrument->startup / nloops;
+ double total_ms = 1000.0 * instrument->total / nloops;
+ double rows = instrument->ntuples / nloops;
+
+ if (es->format == EXPLAIN_FORMAT_TEXT)
+ {
+ if (isworker)
+ ExplainIndentText(es);
+ else
+ appendStringInfo(es->str, " (");
+
+ if (es->timing)
+ appendStringInfo(es->str,
+ "actual time=%.3f..%.3f rows=%.0f loops=%.0f",
+ startup_ms, total_ms, rows, nloops);
+ else
+ appendStringInfo(es->str,
+ "actual rows=%.0f loops=%.0f",
+ rows, nloops);
+
+ if (!isworker)
+ appendStringInfoChar(es->str, ')');
+ }
+ else
+ {
+ if (es->timing)
+ {
+ ExplainPropertyFloat("Actual Startup Time", "ms", startup_ms,
+ 3, es);
+ ExplainPropertyFloat("Actual Total Time", "ms", total_ms,
+ 3, es);
+ }
+ ExplainPropertyFloat("Actual Rows", NULL, rows, 0, es);
+ ExplainPropertyFloat("Actual Loops", NULL, nloops, 0, es);
+ }
+}
+
/*
* Explain the constituent plans of an Append, MergeAppend,
* BitmapAnd, or BitmapOr node.
--
2.30.1 (Apple Git-130)
From: Ekaterina Sokolova <e.sokol...@postgrespro.ru>
Subject: [PATCH 2/2] Add extra statistics to explain for Nested Loop
For some distributions of data in tables, different loops in nested loop
joins can take different time and process different amounts of entries.
It makes average statistics returned by explain analyze not very useful for DBA.
This patch add collecting of min, max and total statistics for time and rows
across all loops to EXPLAIN ANALYSE. You need to set the VERBOSE flag to display
this information. The patch contains regression tests.
Example of results in TEXT format:
-> Append (actual rows=5 loops=5)
Loop Min Rows: 2 Max Rows: 6 Total Rows: 23
Reviewed-by: Lukas Fittl, Justin Pryzby, Yugo Nagata, Julien Rouhaud, Greg Stark.
---
src/backend/commands/explain.c | 40 +++++++
src/backend/executor/instrument.c | 40 ++++++-
src/include/executor/instrument.h | 10 ++
src/test/regress/expected/explain.out | 10 ++
src/test/regress/expected/partition_prune.out | 105 ++++++++++++++++++
src/test/regress/sql/partition_prune.sql | 34 ++++++
6 files changed, 238 insertions(+), 1 deletion(-)
diff --git a/src/backend/commands/explain.c b/src/backend/commands/explain.c
index bd785c6741d..04e66a67cdb 100644
--- a/src/backend/commands/explain.c
+++ b/src/backend/commands/explain.c
@@ -541,6 +541,9 @@ ExplainOnePlan(PlannedStmt *plannedstmt, IntoClause *into, ExplainState *es,
if (es->wal)
instrument_option |= INSTRUMENT_WAL;
+ if (es->verbose)
+ instrument_option |= INSTRUMENT_EXTRA;
+
/*
* We always collect timing for the entire statement, even when node-level
* timing is off, so we don't look at es->timing here. (We could skip
@@ -1624,6 +1627,7 @@ ExplainNode(PlanState *planstate, List *ancestors,
appendStringInfoString(es->str, " (never executed)");
else
{
+ /* without min and max values because actual result is 0 */
if (es->timing)
{
ExplainPropertyFloat("Actual Startup Time", "ms", 0.0, 3, es);
@@ -4051,6 +4055,11 @@ show_loop_info(Instrumentation *instrument, bool isworker, ExplainState *es)
double startup_ms = 1000.0 * instrument->startup / nloops;
double total_ms = 1000.0 * instrument->total / nloops;
double rows = instrument->ntuples / nloops;
+ double loop_total_rows = instrument->ntuples;
+ double loop_min_r = instrument->min_tuples;
+ double loop_max_r = instrument->max_tuples;
+ double loop_min_t_ms = 1000.0 * instrument->min_t;
+ double loop_max_t_ms = 1000.0 * instrument->max_t;
if (es->format == EXPLAIN_FORMAT_TEXT)
{
@@ -4070,6 +4079,21 @@ show_loop_info(Instrumentation *instrument, bool isworker, ExplainState *es)
if (!isworker)
appendStringInfoChar(es->str, ')');
+
+ if (nloops > 1 && es->verbose)
+ {
+ appendStringInfoChar(es->str, '\n');
+ ExplainIndentText(es);
+
+ if (es->timing)
+ appendStringInfo(es->str,
+ "Loop Min Rows: %.0f Max Rows: %.0f Total Rows: %.0f Min Time: %.3f Max Time: %.3f",
+ loop_min_r, loop_max_r, loop_total_rows, loop_min_t_ms, loop_max_t_ms);
+ else
+ appendStringInfo(es->str,
+ "Loop Min Rows: %.0f Max Rows: %.0f Total Rows: %.0f",
+ loop_min_r, loop_max_r, loop_total_rows);
+ }
}
else
{
@@ -4079,8 +4103,24 @@ show_loop_info(Instrumentation *instrument, bool isworker, ExplainState *es)
3, es);
ExplainPropertyFloat("Actual Total Time", "ms", total_ms,
3, es);
+ if (nloops > 1 && es->verbose)
+ {
+ ExplainPropertyFloat("Loop Min Time", "ms", loop_min_t_ms,
+ 3, es);
+ ExplainPropertyFloat("Loop Max Time", "ms", loop_max_t_ms,
+ 3, es);
+ }
}
+
ExplainPropertyFloat("Actual Rows", NULL, rows, 0, es);
+
+ if (nloops > 1 && es->verbose)
+ {
+ ExplainPropertyFloat("Loop Min Rows", NULL, loop_min_r, 0, es);
+ ExplainPropertyFloat("Loop Max Rows", NULL, loop_max_r, 0, es);
+ ExplainPropertyFloat("Loop Total Rows", NULL, loop_total_rows, 0, es);
+ }
+
ExplainPropertyFloat("Actual Loops", NULL, nloops, 0, es);
}
}
diff --git a/src/backend/executor/instrument.c b/src/backend/executor/instrument.c
index ceff4727d4a..e64ae77f005 100644
--- a/src/backend/executor/instrument.c
+++ b/src/backend/executor/instrument.c
@@ -34,11 +34,12 @@ InstrAlloc(int n, int instrument_options, bool async_mode)
/* initialize all fields to zeroes, then modify as needed */
instr = palloc0(n * sizeof(Instrumentation));
- if (instrument_options & (INSTRUMENT_BUFFERS | INSTRUMENT_TIMER | INSTRUMENT_WAL))
+ if (instrument_options & (INSTRUMENT_BUFFERS | INSTRUMENT_TIMER | INSTRUMENT_WAL | INSTRUMENT_EXTRA))
{
bool need_buffers = (instrument_options & INSTRUMENT_BUFFERS) != 0;
bool need_wal = (instrument_options & INSTRUMENT_WAL) != 0;
bool need_timer = (instrument_options & INSTRUMENT_TIMER) != 0;
+ bool need_extra = (instrument_options & INSTRUMENT_EXTRA) != 0;
int i;
for (i = 0; i < n; i++)
@@ -46,6 +47,7 @@ InstrAlloc(int n, int instrument_options, bool async_mode)
instr[i].need_bufusage = need_buffers;
instr[i].need_walusage = need_wal;
instr[i].need_timer = need_timer;
+ instr[i].need_extra = need_extra;
instr[i].async_mode = async_mode;
}
}
@@ -61,6 +63,7 @@ InstrInit(Instrumentation *instr, int instrument_options)
instr->need_bufusage = (instrument_options & INSTRUMENT_BUFFERS) != 0;
instr->need_walusage = (instrument_options & INSTRUMENT_WAL) != 0;
instr->need_timer = (instrument_options & INSTRUMENT_TIMER) != 0;
+ instr->need_extra = (instrument_options & INSTRUMENT_EXTRA) != 0;
}
/* Entry to a plan node */
@@ -154,6 +157,37 @@ InstrEndLoop(Instrumentation *instr)
instr->startup += instr->firsttuple;
instr->total += totaltime;
instr->ntuples += instr->tuplecount;
+
+ /*
+ * this is first loop
+ *
+ * We only initialize the min values. We don't need to bother with the
+ * max, because those are 0 and the non-zero values will get updated a
+ * couple lines later.
+ */
+ if (instr->need_extra)
+ {
+ if (instr->nloops == 0)
+ {
+ instr->min_t = totaltime;
+ instr->min_tuples = instr->tuplecount;
+ }
+ else
+ {
+ if (instr->min_t > totaltime)
+ instr->min_t = totaltime;
+
+ if (instr->min_tuples > instr->tuplecount)
+ instr->min_tuples = instr->tuplecount;
+ }
+
+ if (instr->max_t < totaltime)
+ instr->max_t = totaltime;
+
+ if (instr->max_tuples < instr->tuplecount)
+ instr->max_tuples = instr->tuplecount;
+ }
+
instr->nloops += 1;
/* Reset for next cycle (if any) */
@@ -186,6 +220,10 @@ InstrAggNode(Instrumentation *dst, Instrumentation *add)
dst->nloops += add->nloops;
dst->nfiltered1 += add->nfiltered1;
dst->nfiltered2 += add->nfiltered2;
+ dst->min_t = Min(dst->min_t, add->min_t);
+ dst->max_t = Max(dst->max_t, add->max_t);
+ dst->min_tuples = Min(dst->min_tuples, add->min_tuples);
+ dst->max_tuples = Max(dst->max_tuples, add->max_tuples);
/* Add delta of buffer usage since entry to node's totals */
if (dst->need_bufusage)
diff --git a/src/include/executor/instrument.h b/src/include/executor/instrument.h
index 2945cce3a97..1d7a5f9c177 100644
--- a/src/include/executor/instrument.h
+++ b/src/include/executor/instrument.h
@@ -60,6 +60,8 @@ typedef enum InstrumentOption
INSTRUMENT_BUFFERS = 1 << 1, /* needs buffer usage */
INSTRUMENT_ROWS = 1 << 2, /* needs row count */
INSTRUMENT_WAL = 1 << 3, /* needs WAL usage */
+ INSTRUMENT_EXTRA = 1 << 4, /* needs counters for min,
+ * max and total values */
INSTRUMENT_ALL = PG_INT32_MAX
} InstrumentOption;
@@ -69,6 +71,8 @@ typedef struct Instrumentation
bool need_timer; /* true if we need timer data */
bool need_bufusage; /* true if we need buffer usage data */
bool need_walusage; /* true if we need WAL usage data */
+ bool need_extra; /* true if we need min, max and total
+ * statistics for loops */
bool async_mode; /* true if node is in async mode */
/* Info about current plan cycle: */
bool running; /* true if we've completed first tuple */
@@ -81,7 +85,13 @@ typedef struct Instrumentation
/* Accumulated statistics across all completed cycles: */
double startup; /* total startup time (in seconds) */
double total; /* total time (in seconds) */
+ double min_t; /* time of fastest loop (in seconds) */
+ double max_t; /* time of slowest loop (in seconds) */
double ntuples; /* total tuples produced */
+ double min_tuples; /* min counter of produced tuples for all
+ * loops */
+ double max_tuples; /* max counter of produced tuples for all
+ * loops */
double ntuples2; /* secondary node-specific tuple counter */
double nloops; /* # of run cycles for this node */
double nfiltered1; /* # of tuples removed by scanqual or joinqual */
diff --git a/src/test/regress/expected/explain.out b/src/test/regress/expected/explain.out
index 48620edbc2b..957771be2ba 100644
--- a/src/test/regress/expected/explain.out
+++ b/src/test/regress/expected/explain.out
@@ -369,8 +369,13 @@ select jsonb_pretty(
"Actual Loops": 0, +
"Startup Cost": 0.0, +
"Async Capable": false, +
+ "Loop Max Rows": 0, +
+ "Loop Max Time": 0.0, +
+ "Loop Min Rows": 0, +
+ "Loop Min Time": 0.0, +
"Relation Name": "tenk1", +
"Parallel Aware": true, +
+ "Loop Total Rows": 0, +
"Local Hit Blocks": 0, +
"Temp Read Blocks": 0, +
"Actual Total Time": 0.0, +
@@ -415,7 +420,12 @@ select jsonb_pretty(
"Actual Loops": 0, +
"Startup Cost": 0.0, +
"Async Capable": false, +
+ "Loop Max Rows": 0, +
+ "Loop Max Time": 0.0, +
+ "Loop Min Rows": 0, +
+ "Loop Min Time": 0.0, +
"Parallel Aware": false, +
+ "Loop Total Rows": 0, +
"Sort Space Used": 0, +
"Local Hit Blocks": 0, +
"Temp Read Blocks": 0, +
diff --git a/src/test/regress/expected/partition_prune.out b/src/test/regress/expected/partition_prune.out
index 7555764c779..d8afab5025d 100644
--- a/src/test/regress/expected/partition_prune.out
+++ b/src/test/regress/expected/partition_prune.out
@@ -1962,6 +1962,23 @@ begin
end loop;
end;
$$;
+create function explain_verbose_parallel_append(text) returns setof text
+language plpgsql as
+$$
+declare
+ ln text;
+begin
+ for ln in
+ execute format('explain (analyze, verbose, costs off, summary off, timing off) %s',
+ $1)
+ loop
+ ln := regexp_replace(ln, 'actual rows=\d+ loops=\d+', 'actual rows=N loops=N');
+ ln := regexp_replace(ln, 'Loop Min Rows: \d+ Max Rows: \d+ Total Rows: \d+',
+ 'Loop Min Rows: N Max Rows: N Total Rows: N');
+ return next ln;
+ end loop;
+end;
+$$;
prepare ab_q4 (int, int) as
select avg(a) from ab where a between $1 and $2 and b < 4;
-- Encourage use of parallel plans
@@ -2218,7 +2235,29 @@ select explain_parallel_append('select avg(ab.a) from ab inner join lprt_a a on
Index Cond: (a = a.a)
(28 rows)
+-- Tests for extra statistics
+set parallel_leader_participation = off;
+create table lprt_b (b int not null);
+insert into lprt_b select generate_series(1,20);
+select explain_verbose_parallel_append('select * from lprt_a join lprt_b on a != b');
+ explain_verbose_parallel_append
+---------------------------------------------------------------
+ Nested Loop (actual rows=N loops=N)
+ Output: lprt_a.a, lprt_b.b
+ Join Filter: (lprt_a.a <> lprt_b.b)
+ Rows Removed by Join Filter: 4
+ -> Seq Scan on public.lprt_b (actual rows=N loops=N)
+ Output: lprt_b.b
+ -> Materialize (actual rows=N loops=N)
+ Loop Min Rows: N Max Rows: N Total Rows: N
+ Output: lprt_a.a
+ -> Seq Scan on public.lprt_a (actual rows=N loops=N)
+ Output: lprt_a.a
+(11 rows)
+
+drop table lprt_b;
delete from lprt_a where a = 1;
+reset parallel_leader_participation;
select explain_parallel_append('select avg(ab.a) from ab inner join lprt_a a on ab.a = a.a where a.a in(1, 0, 0)');
explain_parallel_append
-------------------------------------------------------------------------------------------------
@@ -2715,6 +2754,72 @@ order by tbl1.col1, tprt.col1;
1001 | 1001
(3 rows)
+-- Tests for extra statistics
+explain (analyze, verbose, costs off, summary off, timing off)
+select * from tbl1 inner join tprt on tbl1.col1 > tprt.col1;
+ QUERY PLAN
+---------------------------------------------------------------------------------
+ Nested Loop (actual rows=23 loops=1)
+ Output: tbl1.col1, tprt.col1
+ -> Seq Scan on public.tbl1 (actual rows=5 loops=1)
+ Output: tbl1.col1
+ -> Append (actual rows=5 loops=5)
+ Loop Min Rows: 2 Max Rows: 6 Total Rows: 23
+ -> Index Scan using tprt1_idx on public.tprt_1 (actual rows=2 loops=5)
+ Loop Min Rows: 2 Max Rows: 2 Total Rows: 10
+ Output: tprt_1.col1
+ Index Cond: (tprt_1.col1 < tbl1.col1)
+ -> Index Scan using tprt2_idx on public.tprt_2 (actual rows=3 loops=4)
+ Loop Min Rows: 2 Max Rows: 3 Total Rows: 11
+ Output: tprt_2.col1
+ Index Cond: (tprt_2.col1 < tbl1.col1)
+ -> Index Scan using tprt3_idx on public.tprt_3 (actual rows=1 loops=2)
+ Loop Min Rows: 1 Max Rows: 1 Total Rows: 2
+ Output: tprt_3.col1
+ Index Cond: (tprt_3.col1 < tbl1.col1)
+ -> Index Scan using tprt4_idx on public.tprt_4 (never executed)
+ Output: tprt_4.col1
+ Index Cond: (tprt_4.col1 < tbl1.col1)
+ -> Index Scan using tprt5_idx on public.tprt_5 (never executed)
+ Output: tprt_5.col1
+ Index Cond: (tprt_5.col1 < tbl1.col1)
+ -> Index Scan using tprt6_idx on public.tprt_6 (never executed)
+ Output: tprt_6.col1
+ Index Cond: (tprt_6.col1 < tbl1.col1)
+(27 rows)
+
+explain (analyze, verbose, costs off, summary off, timing off)
+select * from tbl1 inner join tprt on tbl1.col1 = tprt.col1;
+ QUERY PLAN
+---------------------------------------------------------------------------------
+ Nested Loop (actual rows=3 loops=1)
+ Output: tbl1.col1, tprt.col1
+ -> Seq Scan on public.tbl1 (actual rows=5 loops=1)
+ Output: tbl1.col1
+ -> Append (actual rows=1 loops=5)
+ Loop Min Rows: 0 Max Rows: 1 Total Rows: 3
+ -> Index Scan using tprt1_idx on public.tprt_1 (never executed)
+ Output: tprt_1.col1
+ Index Cond: (tprt_1.col1 = tbl1.col1)
+ -> Index Scan using tprt2_idx on public.tprt_2 (actual rows=1 loops=2)
+ Loop Min Rows: 1 Max Rows: 1 Total Rows: 2
+ Output: tprt_2.col1
+ Index Cond: (tprt_2.col1 = tbl1.col1)
+ -> Index Scan using tprt3_idx on public.tprt_3 (actual rows=0 loops=3)
+ Loop Min Rows: 0 Max Rows: 1 Total Rows: 1
+ Output: tprt_3.col1
+ Index Cond: (tprt_3.col1 = tbl1.col1)
+ -> Index Scan using tprt4_idx on public.tprt_4 (never executed)
+ Output: tprt_4.col1
+ Index Cond: (tprt_4.col1 = tbl1.col1)
+ -> Index Scan using tprt5_idx on public.tprt_5 (never executed)
+ Output: tprt_5.col1
+ Index Cond: (tprt_5.col1 = tbl1.col1)
+ -> Index Scan using tprt6_idx on public.tprt_6 (never executed)
+ Output: tprt_6.col1
+ Index Cond: (tprt_6.col1 = tbl1.col1)
+(26 rows)
+
-- Last partition
delete from tbl1;
insert into tbl1 values (4400);
diff --git a/src/test/regress/sql/partition_prune.sql b/src/test/regress/sql/partition_prune.sql
index d70bd8610cb..2f7927c7ec1 100644
--- a/src/test/regress/sql/partition_prune.sql
+++ b/src/test/regress/sql/partition_prune.sql
@@ -469,6 +469,24 @@ begin
end;
$$;
+create function explain_verbose_parallel_append(text) returns setof text
+language plpgsql as
+$$
+declare
+ ln text;
+begin
+ for ln in
+ execute format('explain (analyze, verbose, costs off, summary off, timing off) %s',
+ $1)
+ loop
+ ln := regexp_replace(ln, 'actual rows=\d+ loops=\d+', 'actual rows=N loops=N');
+ ln := regexp_replace(ln, 'Loop Min Rows: \d+ Max Rows: \d+ Total Rows: \d+',
+ 'Loop Min Rows: N Max Rows: N Total Rows: N');
+ return next ln;
+ end loop;
+end;
+$$;
+
prepare ab_q4 (int, int) as
select avg(a) from ab where a between $1 and $2 and b < 4;
@@ -528,8 +546,17 @@ insert into lprt_a values(3),(3);
select explain_parallel_append('select avg(ab.a) from ab inner join lprt_a a on ab.a = a.a where a.a in(1, 0, 3)');
select explain_parallel_append('select avg(ab.a) from ab inner join lprt_a a on ab.a = a.a where a.a in(1, 0, 0)');
+-- Tests for extra statistics
+set parallel_leader_participation = off;
+create table lprt_b (b int not null);
+insert into lprt_b select generate_series(1,20);
+select explain_verbose_parallel_append('select * from lprt_a join lprt_b on a != b');
+drop table lprt_b;
+
delete from lprt_a where a = 1;
+reset parallel_leader_participation;
+
select explain_parallel_append('select avg(ab.a) from ab inner join lprt_a a on ab.a = a.a where a.a in(1, 0, 0)');
reset enable_hashjoin;
@@ -654,6 +681,13 @@ select tbl1.col1, tprt.col1 from tbl1
inner join tprt on tbl1.col1 = tprt.col1
order by tbl1.col1, tprt.col1;
+-- Tests for extra statistics
+explain (analyze, verbose, costs off, summary off, timing off)
+select * from tbl1 inner join tprt on tbl1.col1 > tprt.col1;
+
+explain (analyze, verbose, costs off, summary off, timing off)
+select * from tbl1 inner join tprt on tbl1.col1 = tprt.col1;
+
-- Last partition
delete from tbl1;
insert into tbl1 values (4400);
--
2.30.1 (Apple Git-130)
-- Tests for pgbench with using extra statistics for loops
-- pgbench -i -n database
-- pgbench -f -n path_to/pgbench_loop database
EXPLAIN (analyze, verbose, costs off, summary off, timing off)
SELECT * FROM pgbench_accounts JOIN pgbench_tellers on aid != tid;
EXPLAIN (analyze, verbose, costs off, summary off, timing off)
SELECT * FROM pgbench_accounts JOIN pgbench_tellers on aid = tid;
EXPLAIN (analyze, verbose, costs off, summary off, timing off)
SELECT * FROM pgbench_accounts JOIN pgbench_tellers on aid > tid;
EXPLAIN (analyze, verbose, costs on, summary on, timing on)
SELECT * FROM pgbench_accounts JOIN pgbench_tellers on aid != tid;
EXPLAIN (analyze, verbose, costs on, summary on, timing on)
SELECT * FROM pgbench_accounts JOIN pgbench_tellers on aid = tid;
EXPLAIN (analyze, verbose, costs on, summary on, timing on)
SELECT * FROM pgbench_accounts JOIN pgbench_tellers on aid > tid;
-- Tests for pgbench with using extra statistics for loops
-- pgbench -i -n database
-- pgbench -f -n path_to/pgbench_loop_without_verbose database
EXPLAIN (analyze, verbose off, costs off, summary off, timing off)
SELECT * FROM pgbench_accounts JOIN pgbench_tellers on aid != tid;
EXPLAIN (analyze, verbose off, costs off, summary off, timing off)
SELECT * FROM pgbench_accounts JOIN pgbench_tellers on aid = tid;
EXPLAIN (analyze, verbose off, costs off, summary off, timing off)
SELECT * FROM pgbench_accounts JOIN pgbench_tellers on aid > tid;
EXPLAIN (analyze, verbose off, costs, summary, timing)
SELECT * FROM pgbench_accounts JOIN pgbench_tellers on aid != tid;
EXPLAIN (analyze, verbose off, costs, summary, timing)
SELECT * FROM pgbench_accounts JOIN pgbench_tellers on aid = tid;
EXPLAIN (analyze, verbose off, costs, summary, timing)
SELECT * FROM pgbench_accounts JOIN pgbench_tellers on aid > tid;
VERBOSE ON:
master/new latency | 0,95900 |
master/new tps | 1,04159 |
VERBOSE OFF:
master/new latency | 0,98693 |
master/new tps | 1,01271 |
